Daniel F. Akerson

Chairman and Chief Executive Officer

General Motors Company Mail Code 482-C39-B10 300 Renaissance Center Detroit, MI 48265- 3000

Tel 313

- 667

- 3588 Fax 313

- 667

- 3122

July 29 , 2011

The Honorable Ray LaHood Secretary U.S. Department of Transportation 1200 New Jersey Avenue, S.E. Washington, D.C. 20590

The Honorable Lisa Jackson

Administrator Environmental Protection Agency Ariel Rios Building 1200 Pennsylvania Avenue, N.W. Washington, D.C. 20460

Dear Secretary LaHood and Administrator Jackson:

General Motors Company recognizes the benefit for the country of continuing the historic National Program to address fuel economy and greenhouse gases that the Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) began in 2009 with the standards for model years 2012 through 2016, and that those agencies are continuing for model years 2017 through 2025.

General Motors Company fully supports proposal and adoption of a continued National Program. We understand that the continued National Program will be subject to full notice-and-comment rulemaking, affording all interested parties, including General Motors Company, the right to participate fully, comment, and submit information, the results of which are not pre-determined but depend upon processes set by law. General Motors Company welcomes the opportunity to be a partner in helping to advance a continued, harmonized National Program.

General Motors Company believes that the robust and comprehensive mid-term evaluation described by EPA and NHTSA in the Supplemental Notice of Intent is critical, given General Motors Company’s view of the uncertainty associated with the model years 2022-2025 standards. Although General Motors Company may not have full knowledge about the evolution and cost of technologies necessary to meet these standards, particularly in 2022-2025, the mid-term evaluation provides a basis for General Motors Company’s support for adoption of standards for model years that far into the future.

General Motors Company also commits to working with EPA and NHTSA, the states, and other stakeholders to help our country address the need to reduce dependence on oil, to save consumers money, and to ensure regulatory predictability and certainty by developing this kind of strong, coordinated National Program.The Honorable Ray LaHood

The Honorable Lisa Jackson Page Two July 29, 2011

In order to promote the adoption of the continued National Program, General Motors Company commits to take the following actions, subject to the understandings described below.

1. General Motors Company commits not to contest the final standards established by this rulemaking and by California for MYs 2017 through 2025

if:

a. EP A proposes national GHG standards and NHTSA proposes CAFE standards for MYs 2017-2025 as substantially described in the Supplemental Notice of Intent to conduct rulemaking, but with necessary technical corrections and any non-substantive refinements, and if the agencies adopt standards as substantially proposed.

b. California adopts standards on GHG emissions from new motor vehicles for MYs 2017 through 2025 such that compliance with the GHG emissions standards adopted by EPA, even if amended after 2012, shall be deemed compliance with the California GHG emissions standards, in a manner that is binding on states that adopt and enforce California’s GHG standards under Clean Air Act (CAA) section 177.

2. General Motors Company reserves all rights to contest final actions taken or not taken by EPA, NHTSA, and CARB as part of or in response to the

mid- term evaluation.

3. General Motors Company commits that it will not contest final actions taken or not taken by EPA granting California’s future request for a waiver of preemption under section 209 of the CAA for its GHG emissions standards for motor vehicles for MYs 2017-2025, if California revises its regulations as described above in (1)(b), but this does not apply to subsequent amendments California may make.

4. General Motors Company will use its best efforts to ensure that the trade association(s) to which General Motors Company belongs will not contest the actions discussed in (1) and (3) above.

Sincerely,

Daniel F. Akerson

Chairman and Chief Executive Officer